题目内容：

病句诊所
1All them work very hard.
2The supermarket opens 24 hours.
3Ithink the shop is ciose at this time of day.

优质解答

如果是添加介词的话,第一句貌似应该是：1.all of them work very hard 2.the supermarket opened 24 hours3.i think the shop is closeing at this ime of a day（貌似你抄错了的,）